“There are SOOOOOO many dirty, mysterious things about this FBI Field Killing that I just cant help it.”
The way I heard it the guy picked the wrong place/time to go jihadi. Never attack a cop if you have plans for the rest of your life.
He probably thought he had gotten away with everything, talked his way out of it, and was almost home free - and then the FBI showed up again - and brought two Massachusetts state troopers with them.
At that point he knew he was either going to die in federal prison or die a martyr to his ridiculous cause.
He chose the latter.
Or, if you listen to other posters, he knew a secret code that proved that the CIA were the Illuminati and was killed before he could go public. Or something.
Whatever you think is more logical.